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Earnings Per Share
 12 Months Ended
Dec. 31, 2011
Earnings Per Share [Abstract]  
Earnings Per Share

15. Earnings Per Share

     The following table sets forth the computation of basic and diluted earnings per share (in thousands, except per share data):

   Year Ended December 31,
   2011 2010 2009
Numerator for basic and diluted earnings         
 per share - net income attributable to         
 common stockholders $ 157,108 $ 106,882 $ 171,190
           
Denominator for basic earnings per          
 share - weighted average shares   173,741   127,656   114,207
Effect of dilutive securities:         
 Employee stock options   176   125   0
 Non-vested restricted shares   246   420   405
 Convertible senior unsecured notes   238   7   0
Dilutive potential common shares   660   552   405
Denominator for diluted earnings per         
 share - adjusted weighted average shares   174,401   128,208   114,612
           
Basic earnings per share $ 0.90 $ 0.84 $ 1.50
Diluted earnings per share $ 0.90 $ 0.83 $ 1.49

The diluted earnings per share calculations exclude the dilutive effect of 0, 280,000 and 351,000 stock options for the years ended December 31, 2011, 2010 and 2009, respectively, because the exercise prices were more than the average market price. The outstanding convertible senior unsecured notes were not included in the 2009 calculations as the effect of the conversions into common stock was anti-dilutive for that period. The Series H Cumulative Convertible and Redeemable Preferred Stock issued in 2010 was excluded from the calculations for 2010 and 2011 as the effect of the conversions was anti-dilutive.